Active matrix organic light-emitting diode pixel circuit, method for driving the same, and display device

ABSTRACT

The present disclosure relates to a field of display technology, and provides an AMOLED pixel circuit, a method for driving the same, and a display device, which can improve an integration of an in-cell touch control circuit with an AMOLED driving circuit. The AMOLED pixel circuit comprises a light-emitting module, a touch control module, a control module, and a driving and amplifying module. The MOLED pixel circuit provided in embodiments of the present disclosure can be used in the manufacture of the AMOLED display device.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is based on International Application No.PCT/CN2013/084630 filed on Sep. 29, 2013, which claims priority toChinese National Application No. 201310259983.6 filed on Jun. 26, 2013.The entire contents of each and every foregoing application areincorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a field of display technology,particularly to an Active Matrix Organic Light-Emitting Diode (AMOLED)pixel circuit, a method for driving the same, and a display device.

BACKGROUND

With rapid development of the display technology, display devices with atouch control function are gradually popular since they have advantagessuch as visualization operation. In general, the existing displaydevices with the touch control function can be classified into displaydevices with an on-cell touch screen panel and display devices with anin-cell touch screen panel according to the position of the touch screenpanel relative to the display panel. Compared to the on-cell touchscreen panel, the in-cell touch screen panel is thinner in thickness andhas a higher light transmittance.

For existing display devices, the Organic Light Emitting Diode (OLED),as a current type light-emitting element, is increasingly applied to thefield of high performance display, since it has characteristics such asself-luminance, rapid response, wide view angle, and capability of beingmanufactured on a flexible substrate, and the like. OLED display devicescan be classified into Passive Matrix Driving OLED display devices andActive Matrix Driving OLED display devices, wherein since an AMOLEDdisplay device has advantages such as low cost in production, highresponse speed, energy-saving, direct-current driving capabilityavailable to a portable apparatus, wide operating temperature range, andthe like, it tends to replace the Liquid Crystal Display to be as a nextgeneration of a novel flat panel display. Therefore, the AMOLED displaypanel with the in-cell touch control function has increasingly gainedfavor with customer.

In an existing AMOLED display panel, each OLED is driven by a drivingcircuit comprising a plurality of Thin Film Transistors (TFTs) in apixel unit on an array substrate to emit light so as to realize imagedisplay. In the in-cell Touch Screen Panel (TSP), sensors and a drivingcircuit for touch are manufactured in each pixel unit on the arraysubstrate by the array technical process. If the sensors and the drivingcircuit for the TSP are incorporated to the AMOLED pixel, a certainnumber of TFTs for the driving circuit are required to be added, thusoccupying a certain extra space in a pixel unit; however the spare spacein the pixel unit is limited, which significantly constrains the in-celltouch screen panel circuit and the AMOLED driving circuit from beingmanufactured simultaneously.

SUMMARY

In embodiments of the present disclosure, there are provided an AMOLEDpixel circuit, a method for driving the same, and a display device,which can improve an integration of an in-cell touch control circuitwith an AMOLED driving circuit.

In order to achieve the above purpose, the embodiments of the presentdisclosure utilize the following technical solutions.

In one aspect of the embodiments of the present disclosure, there isprovided an AMOLED pixel circuit comprising: a light-emitting module, atouch control module, a control module, and a driving and amplifyingmodule;

the light-emitting module is connected to the control module and a firstvoltage terminal, and is used for emitting light for display under thecontrol of the control module;

the touch control module is connected to the control module, a secondsignal line, and is used for receiving a touch control signal as input;

the control module is further connected to a first signal line, thesecond signal line, a third signal line, and a data line, and is usedfor controlling the light-emitting module and the touch control moduleaccording to signals input from the signal lines; and

the driving and amplifying module is connected to the light-emittingmodule, the touch control module, the control module and a secondvoltage terminal, and is used for driving the light-emitting module oramplifying the touch control signal received by the touch controlmodule.

Further, the light-emitting module comprises:

a first transistor having a gate connected the control module and asecond electrode connected to the driving and amplifying module;

a light-emitting element having one terminal connected to a firstelectrode of the first transistor and the other terminal connected tothe first voltage terminal

Further, the control module comprises:

a second transistor having a gate connected to the first signal line, afirst electrode connected to the light-emitting element, and a secondelectrode connected to the driving and amplifying module;

a third transistor having a gate connected to the third signal line, afirst electrode connected to the gate of the first transistor, and asecond electrode connected to the data line; and

a fourth transistor having a gate connected to the second signal line, afirst electrode connected to the driving and amplifying module, and asecond electrode connected to the data line.

Further, the driving and amplifying module comprises:

a fifth transistor having a gate connected to the first electrode of thethird transistor, a first electrode connected to the second voltageterminal, and a second electrode connected to the first electrode of thefourth transistor;

a sixth transistor having a gate connected to the first electrode of thethird transistor, a first electrode connected to the second voltageterminal, and a second electrode connected to the second electrode ofthe first transistor and the second electrode of the second transistor;and

a storage capacitor having one terminal connected to the first electrodeof the third transistor, and the other terminal connected to the secondvoltage terminal.

Further, the touch control module comprises:

a seventh transistor having a gate connected to the second signal line,and a first electrode connected to the first electrode of the thirdtransistor; and

an optoelectronic diode having an anode connected to the second voltageterminal, and a cathode connected to a second electrode of the seventhtransistor.

As an alternative, the touch control module comprises:

a seventh transistor having a gate connected to the second signal line,and a first electrode connected to the first electrode of the thirdtransistor; and

a sensing electrode connected to a second electrode of the seventhtransistor.

It should be noted that the first, second, third, fourth, fifth andsixth transistors are N-type transistors, and the seventh transistor isa P-type transistor;

as an alternative, the first, second, third, fourth, fifth and sixthtransistors are P-type transistors, and the seventh transistor is anN-type transistor.

In another aspect of the present disclosure, there is provided a displaydevice comprising any of the AMOLED pixel circuits as described above.

In still another aspect of the present disclosure, there is provided amethod for driving the AMOLED pixel circuit, wherein the methodcomprises:

switching off the light-emitting module, inputting an initializationsignal from the data line, and initializing the touch control module andthe driving and amplifying module by the control module according to theinitialization signal;

receiving the touch control signal by the touch control module;

switching off the touch control module, and amplifying the touch controlsignal by the driving and amplifying module and outputting the amplifiedtouch control signal to the data line;

pre-charging the driving and amplifying module via the control module bythe data signal input from the data line;

switching on the light-emitting module, and driving the light-emittingmodule by the driving and amplifying module to emit light for display.

In particular, the method comprises:

an initialization phase, wherein the first transistor is turned off sothat the light-emitting element is switched off, and the seventhtransistor is turned on so that the touch control module is electricallyconnected to the gate of the fifth transistor and the gate of the sixthtransistor, and the storage capacitor serves as a storage capacitor ofthe fifth transistor and the sixth transistor; the third transistor isturned on, the data line inputs the initialization signal, and thestorage capacitor is pre-charged to a level of the initializationsignal;

a touch control phase, wherein the third transistor and the fourthtransistor are turned off, the seventh transistor is turned on, and thetouch control module receives the touch control signal;

a reading phase, wherein the fourth transistor is turned on, the thirdand seventh transistors are turned off, so that the touch control moduleis switched off, and the fifth transistor and the sixth transistoramplify the voltage at the gates of the fifth and sixth transistors andoutput the amplified voltage to the data line;

a writing phase, wherein the seventh transistor is turned off, thesecond, third and fourth transistors are turned on, the data line inputsa grayscale current to charge the gate of the fifth transistor, the gateof the sixth transistor and the storage capacitor;

a light-emitting phase, wherein the second, third, and seventhtransistors are turned off, the first transistor is turned on, the sixthtransistor operates in a linear region, and the second transistoroperates in a saturation region, and the light-emitting element isdriven to emit light for display.

Further, said receiving the touch control signal by the touch controlmodule comprises:

determining to receive the touch control signal by the touch controlmodule according to quantity of the light received by the optoelectronicdiode when a touch control operation is performed; or

determining to receive the touch control signal by the touch controlmodule according to a capacitance value of a sensing capacitor formedbetween a sensing electrode and a touch terminal of the user when thetouch control operation is performed.

It should be noted that the first, second, third, fourth, fifth andsixth transistors are N-type transistors, and the seventh transistor isa P-type transistor; or

the first, second, third, fourth, fifth and sixth transistors are P-typetransistors, and the seventh transistor is an N-type transistor.

In the AMOLED pixel circuit, the method for driving the same and thedisplay device provided in the embodiments of the present disclosure, byintegrating the in-cell touch control circuit into the AMOLED pixelcircuit, the control module and the driving and amplifying module areshared by the light-emitting module and the touch control module. Thus,the in-cell touch control circuit and the AMOLED pixel circuit can bedriven in a time division mode by adjusting the timing sequences of thesignals for driving without increasing the number of the signals, sothat the integration of the in-cell touch control circuit with theAMOLED driving circuit is improved greatly, and it can be realized thatthe in-cell touch screen panel circuit and the AMOLED driving circuitare manufactured simultaneously in the limited space of the pixel unit,thus enhancing the quality of the display product significantly andreducing the difficulties in manufacturing the display product.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly describe the technical solutions of theembodiments of the present disclosure or the prior art, drawingsnecessary for describing the embodiments of the present disclosure orthe prior art are simply introduced as follows. It should be obvious forthose skilled in the art that the drawings described as follows onlyillustrate some embodiments of the present disclosure and other drawingscan be obtained according to these drawings without paying any inventiveefforts.

FIG. 1 is a schematic block diagram illustrating a structure of anAMOLED pixel circuit provided in an embodiment of the presentdisclosure;

FIG. 2 is a schematic circuit diagram illustrating a structure of anAMOLED pixel circuit provided in an embodiment of the presentdisclosure;

FIG. 3 is a schematic circuit diagram illustrating a structure ofanother AMOLED pixel circuit provided in an embodiment of the presentdisclosure; and

FIG. 4 is a schematic waveform diagram of signals for driving the AMOLEDpixel circuit shown in FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

To illustrate the technical solutions of embodiments of the presentdisclosure clearly and fully, hereinafter, detailed descriptions will begiven to the embodiments of the present disclosure in connection withthe accompanying drawings. Obviously, the embodiments as described areonly a part of the embodiments of the present disclosure, and are notall the embodiments of the present disclosure. All the other embodimentswhich are obtained by those skilled in the art based on the embodimentsof the present disclosure without paying any inventive labor fall intothe protection scope of the present disclosure.

The transistors employed in all the embodiments of the presentdisclosure can be thin film transistors, field effect transistors, orany elements with the same characteristics. Since a source and a drainof a transistor utilized herein are symmetrical, there is no distinctionbetween the source and the drain thereof. In the embodiments of thepresent disclosure, in order to make a distinction between twoelectrodes of a transistor other than a gate thereof, one of the twoelectrodes is referred to as a source, and the other is referred to as adrain. Further, a transistor can be classified into an N-type transistoror a P-type transistor based on the characteristics of the transistor;in the embodiments of the present disclosure, when the N-type transistoris employed, the first electrode can be the source, and the secondelectrode can be the drain, and when the P-type transistor is employed,the first electrode can be the drain, and the second electrode can bethe source.

FIG. 1 illustrates an AMOLED pixel circuit provided in an embodiment ofthe present disclosure, wherein the AMOLED pixel circuit comprises: alight-emitting module 11, a touch control module 12, a control module13, and a driving and amplifying module 14.

The light-emitting module 11 is connected to the control module 13 and afirst voltage terminal V1, and is used for emitting light for displayunder the control of the control module 13.

The touch control module 12 is connected to the control module 13, asecond signal line S2 _(—) n, and is used for receiving a touch controlsignal as input.

The control module 13 is further connected to a first signal line S1_(—) n, the second signal line S2 _(—) n, a third signal line S3 _(—) n,and a data line DATA, and is used for controlling the light-emittingmodule 11 and the touch control module 12 according to signals inputfrom the signal lines.

The driving and amplifying module 14 is connected to the light-emittingmodule 11, the touch control module 12, the control module 13 and asecond voltage terminal V2, and is used for driving the light-emittingmodule 11 or amplifying the touch control signal received by the touchcontrol module 12.

In FIG. 1, for simple illustration, both the first signal line S1 _(—) nand a fourth signal line S1 _(—) n−1 are illustrated as S1, wherein thesignal input from the first signal line is generated by delaying thesignal input from the fourth signal line for a predetermined time.

In the AMOLED pixel circuit provided in the embodiment of the presentdisclosure, by integrating the in-cell touch control circuit into theAMOLED pixel circuit, the control module and the driving and amplifyingmodule are shared by the light-emitting module and the touch controlmodule. Thus, the in-cell touch control circuit and the AMOLED pixelcircuit can be driven in a time division mode by adjusting the timingsequences of the signals for driving without increasing the number ofthe signals, so that the integration of the in-cell touch controlcircuit with the AMOLED driving circuit is improved greatly, and it canbe realized that the in-cell touch screen panel circuit and the AMOLEDdriving circuit are manufactured simultaneously in the limited space ofthe pixel unit, thus enhancing the quality of the display productsignificantly and reducing the difficulties in manufacturing the displayproduct.

Optionally, the first voltage terminal V1 can input a high level VDD,and the second voltage terminal V2 can input a low level VSS. Thelight-emitting module 11 and the touch control module 12 in the AMOLEDpixel circuit share one data line DATA, and the data line DATA is mainlyused for inputting a light-emitting control signal to the AMOLED pixelcircuit or for reading the touch control signal from the same in a timedivision mode.

In particular, as illustrated in FIG. 2, in the AMOLED pixel circuitprovided in the embodiment of the present disclosure, the light-emittingmodule 11 can comprise a first transistor T1 having a gate connected thecontrol module 13 and a second electrode connected to the driving andamplifying module 14; a light-emitting element D1 having one terminalconnected to a first electrode of the first transistor T1 and the otherterminal connected to the first voltage terminal V1.

In the embodiments of the present disclosure, the light-emitting elementD1 can be any one of the current-driven light-emitting elementscomprising the Light Emitting Diode (LED), Organic Light Emitting Diode(OLED) and the like in the prior art. In the embodiments of the presentdisclosure, the OLED is taken as an example to illustrate the principleof the embodiments of the present disclosure.

Further, as shown in FIG. 2, the control module 13 can comprise a secondtransistor T2, a third transistor T3 and a fourth transistor T4.

The gate of the second transistor T2 is connected to the first signalline S1 _(—) n, a first electrode of the second transistor T2 isconnected to the light-emitting element D1, and a second electrode ofthe second transistor T2 is connected to the driving and amplifyingmodule 14;

The gate of the third transistor T3 is connected to the third signalline S3 _(—) n, a first electrode of the third transistor T3 isconnected to the gate of the first transistor T1, and a second electrodeof the third transistor T3 is connected to the data line DATA; and

The gate of the fourth transistor T4 is connected to the second signalline S2 _(—) n, a first electrode of the fourth transistor T4 isconnected to the driving and amplifying module 14, and a secondelectrode of the fourth transistor T4 is connected to the data lineDATA.

In the AMOLED pixel circuit shown in FIG. 2, the driving and amplifyingmodule 14 can comprise a fifth transistor T5, a sixth transistor T6 anda storage capacitor C1.

The gate of the fifth transistor T5 is connected to the first electrodeof the third transistor T3, a first electrode of the fifth transistor T5is connected to the second voltage terminal V2, and a second electrodeof the fifth transistor T5 is connected to the first electrode of thefourth transistor T4.

The gate of the sixth transistor T6 is connected to the first electrodeof the third transistor T3, a first electrode of the sixth transistor T6is connected to the second voltage terminal V2, and a second electrodeof the sixth transistor T6 is connected to the second electrode of thefirst transistor T1 and the second electrode of the second transistorT2.

One terminal of the storage capacitor C1 is connected to the firstelectrode of the third transistor T3, and the other terminal of thestorage capacitor C1 is connected to the second voltage terminal V2.

Further, as shown in FIG. 2, the touch control module 12 can comprise aseventh transistor T7 and an optoelectronic diode D2.

The gate of the seventh transistor T7 is connected to the second signalline S2 _(—) n, and a first electrode of the seventh transistor T7 isconnected to the first electrode of the third transistor T3.

The anode of the optoelectronic diode D2 is connected to the secondvoltage terminal V2, and the cathode of the optoelectronic diode D2 isconnected to a second electrode of the seventh transistor T7.

In the touch control module 12 with such a structure, when the userperforms a touch control operation, the quantity of the light receivedby the optoelectronic diode D2 will vary due to the influence of theshading generated by the user in touch, and the optoelectronic diode D2generates different leakage currents according to the different quantityof the light received. An accurate detection of the touch position canbe achieved by observing the leakage currents of the optoelectronicdiodes D2 in different pixel areas on the display panel.

Of course, the touch control module 12 in the AMOLED pixel circuitprovided in the embodiments of the present disclosure is not limited toa photo-sensitive touch control module, and other types of the knowntouch control circuit structures can also be applicable to theembodiments of the present disclosure. For example, in the AMOLED pixelcircuit shown in FIG. 3, the structure of the touch control module 12can further comprise a seventh transistor T7 and a sensing electrode D2.

The gate of the seventh transistor T7 is connected to the second signalline S2 _(—) n, and a first electrode of the seventh transistor T7 isconnected to the first electrode of the third transistor T3.

The sensing electrode is connected to a second electrode of the seventhtransistor T7.

In the touch control module 12 with such a structure, when the userperforms a touch control operation, a sensing capacitor C2 will beformed between a finger of the user or other touch means and the sensingelectrode, and an accurate detection of the touch position can also beachieved by detecting the position of the sensing capacitor.

In an actual application, the two touch control modules 12 with theabove structures respectively can also be selected or replaced accordingto actual requirements.

It should be noted that in the AMOLED pixel circuit provided in theembodiments of the present disclosure, the first, second, third, fourth,fifth and sixth transistors T1, T2, T3, T4, T5 and T6 can be N-typetransistors, and the seventh transistor T7 can be a P-type transistor.As an alternative, the first, second, third, fourth, fifth and sixthtransistors T1, T2, T3, T4, T5 and T6 can be P-type transistors, and theseventh transistor T7 can be an N-type transistor.

In the embodiments of the present disclosure, the case in which thefirst, second, third, fourth, fifth and sixth transistors T1, T2, T3,T4, T5 and T6 are N-type transistors and the seventh transistor T7 is aP-type transistor is taken as an example for illustration, and it can beappreciated that the same driving effect can also be achieved bychanging the levels of the control signals accordingly when the types ofthe transistors are changed.

In the AMOLED pixel circuit with such a structure provided in theembodiment of the present disclosure, the in-cell touch control circuitand the AMOLED pixel circuit are driven in a time division mode byadjusting the timing sequences of the signals for driving withoutincreasing the number of the signals, so that the integration of thein-cell touch control circuit with the AMOLED driving circuit isimproved greatly, and it can be realized that the in-cell touch screenpanel circuit and the AMOLED driving circuit are manufacturedsimultaneously in the limited space of the pixel unit, thus enhancingthe quality of the display product significantly and reducing thedifficulties in manufacturing the display product.

In the embodiments of the present disclosure, there is further provideda display device comprising an organic light-emitting display, otherdisplays, etc. The display device comprises any one of the AMOLED pixelcircuits as described above. The display device can comprise an arraycomprising a plurality of AMOLED pixel units, wherein each of theplurality of the AMOLED pixel units comprises any one of the AMOLEDpixel circuit as described above, which has the same beneficial effectsas the pixel circuit provided in the embodiments of the presentdisclosure. The details are omitted since the detailed descriptions havebeen given to the above embodiments.

Specifically, the display device provided in the embodiments of thepresent disclosure can be any display device having the current-drivenlight-emitting elements comprising the LED display or OLED display.

The display device provided in the embodiments of the present disclosurecomprises the AMOLED pixel circuit, wherein by integrating the in-celltouch control circuit into the AMOLED pixel circuit, the control moduleand the driving and amplifying module are shared by the light-emittingmodule and the touch control module. Thus, the in-cell touch controlcircuit and the AMOLED pixel circuit can be driven in a time divisionmode by adjusting the timing sequences of the signals for drivingwithout increasing the number of the signals, so that the integration ofthe in-cell touch control circuit with the AMOLED driving circuit isimproved greatly, and it can be realized that the in-cell touch screenpanel circuit and the AMOLED driving circuit are manufacturedsimultaneously in the limited space of the pixel unit, thus enhancingthe quality of the display product significantly and reducing thedifficulties in manufacturing the display product.

A method for driving an AMOLED pixel circuit provided in the embodimentsof the present disclosure can be applied to the plurality of AMOLEDpixel circuits provided in the above embodiments of the presentdisclosure, wherein the method comprises:

S101: switching off the light-emitting module, inputting aninitialization signal from the data line, and initializing the touchcontrol module and the driving and amplifying module by the controlmodule according to the initialization signal;

S102: receiving the touch control signal by the touch control module;

S103: switching off the touch control module, and amplifying the touchcontrol signal by the driving and amplifying module and outputting theamplified touch control signal to the data line;

S104: pre-charging the driving and amplifying module via the controlmodule by the data signal input from the data line;

S105: switching on the light-emitting module, and driving thelight-emitting module by the driving and amplifying module to emit lightfor display.

In the method for driving the AMOLED pixel circuit provided in theembodiments of the present disclosure, by integrating the in-cell touchcontrol circuit into the AMOLED pixel circuit, the control module andthe driving and amplifying module are shared by the light-emittingmodule and the touch control module. Thus, the in-cell touch controlcircuit and the AMOLED pixel circuit can be driven in a time divisionmode by adjusting the timing sequences of the signals for drivingwithout increasing the number of the signals, so that the integration ofthe in-cell touch control circuit with the AMOLED driving circuit isimproved greatly, and it can be realized that the in-cell touch screenpanel circuit and the AMOLED driving circuit are manufacturedsimultaneously in the limited space of the pixel unit, thus enhancingthe quality of the display product significantly and reducing thedifficulties in manufacturing the display product.

Hereinafter detailed descriptions will be given to the method fordriving the AMOLED pixel circuit provided in the embodiments of thepresent disclosure by taking the AMOLED pixel circuit shown in FIG. 2 asan example, wherein waveforms of the timing sequences of respective datasignal lines for driving the AMOLED pixel circuit can be as shown inFIG. 4. It should be illustrated that in the embodiments of the presentdisclosure, the gate of the second transistor T2 is connected to thefirst signal line S1 _(—) n; the gate of the fourth transistor T4 isconnected to the second signal line S2 _(—) n, and the gate of theseventh transistor T7 is connected to the second signal line S2 _(—) n,the waveform of the signal S2 _(—) n is obtained by delaying thewaveform of the signal S2 _(—) n−1 for a certain time; the gate of thethird transistor T3 is connected to the third signal line S3 _(—) n, andis input with the signal S3 _(—) n.

In the AMOLED pixel circuit shown in FIG. 2, a case in which the first,second, third, fourth, fifth and sixth transistors T1, T2, T3, T4, T5and T6 are N-type transistors and the seventh transistor T7 is a P-typetransistor is taken as an example for illustration. It can be conceivedthat the same driving effect can also be achieved by changing the levelsof the control signals accordingly when the types of the abovetransistors are changed.

In particular, in combination with the waveforms of the timing sequencesof the respective data signal lines for driving the AMOLED pixel circuitas shown in FIG. 4, and specifically with reference to respectiveoperational phases marked below the DATA signal line in FIG. 4, i.e., aninitialization phase (INITIAL), a touch control phase (PHOTO), a readingphase (READ), a writing phase (WRITE), and a light-emitting phase(OLED), the method for driving the AMOLED pixel circuit provided in theembodiments of the present disclosure can comprise the following phases.

During the initialization phase (INITIAL), the signals S2 _(—) n and S2_(—) n−1 are at a low level, and the signals S1 _(—) n and S3 _(—) n areat a high level; at this time, the first transistor T1 is turned off sothat the light-emitting element is switched off, and the seventhtransistor T7 is turned on so that the touch control module 12 iselectrically connected to the gate of the fifth transistor T5 and thegate of the sixth transistor T6, and the storage capacitor C1 serves asa storage capacitor of the fifth transistor T5 and the sixth transistorT6; the third transistor T3 is turned on, and the data line DATA inputsan initialization signal VINI and pre-charges the storage capacitor C1to a level of the initialization signal VINI.

Thus, the storage capacitor C1 can be pre-charged to the level of theinitialization signal VINI when the touch control module 12 isinitialized, which can ensure that the fifth transistor T5 operates in asaturation and amplification state during the next phase.

During the touch control phase (PHOTO), the signals S2 _(—) n and S3_(—) n are at a low level, and the signals S2 _(—) n and S2 _(—) n−1 areat a high level. At this time, the third transistor T3 and the fourthtransistor T4 are turned off, the seventh transistor T7 is turned on,and the touch control module 12 receives a touch control signal.

The structure of the touch control module 12 can be as shown in FIG. 2.The touch control module 12 comprises an optoelectronic diode D2. In thetouch control module 12 with such a structure, when the user performs atouch control operation, the quantity of the light received by theoptoelectronic diode D2 will vary due to the influence of the shadinggenerated by the user in touch, and the optoelectronic diode D2generates different leakage currents according to the different quantityof the light received. An accurate detection of the touch position canbe achieved by observing the leakage currents of the optoelectronicdiodes D2 in different pixel areas on the display panel.

Of course, the touch control module 12 in the AMOLED pixel circuitprovided in the embodiments of the present disclosure is not limited toa photo-sensitive touch control module, and other types of the knowntouch control circuit structures can also be applicable to theembodiments of the present disclosure. For example, another structure ofthe touch control module 12 can be as shown in FIG. 3, wherein the touchcontrol module 12 comprises a sensing electrode. In the touch controlmodule 12 with such a structure, when the user performs a touch controloperation, a sensing capacitor C2 will be formed between the finger ofthe user or other touch means and the sensing electrode, and an accuratedetection of the touch position can also be achieved by detecting theposition of the sensing capacitor.

In the actual application, the two touch control modules 12 with theabove structures respectively can also be selected or replaced accordingto the actual requirements.

In particular, the detailed descriptions will be given to the touchcontrol phase by taking the photo-sensitive touch control module as anexample. When the third transistor T3 and the fourth transistor T4 areturned off, the optoelectronic diode D2 detects a touch state of thedisplay panel; when the touch screen panel is touched by the finger ofthe user, the optoelectronic diode D2 can not be irradiated by anexternal light source, and the quantity of the light received by the D2is relative small, and the leakage current generated by the sensed lightis small, and the variation of the voltage level of the storagecapacitor C1 during the PHOTO phase due to the leakage current is small;when the display panel is not touched, the optoelectronic diode D2 canbe irradiated by the external light source, and the quantity of thelight received by the D2 is large, and a large leakage current isgenerated by the sensed light, and then the variation of the voltagelevel of the storage capacitor C1 during the PHOTO phase due to theleakage current is large. Therefore, if the touch screen panel istouched, the variation of the voltage at the gate of the amplifyingtransistor T6 relative to an initial voltage is small; and if the touchscreen panel is not touched, the variation of the voltage at the gate ofthe amplifying transistor T6 relative to the initial voltage is large.

During the reading phase (READ), the signal S3 _(—) n is at a low level,and the signals S2 _(—) n−1, S1 _(—) n and S2 _(—) n are at a highlevel. At this time, the fourth transistor T4 is turned on, and thethird transistor T3 and the seventh transistor T7 are turned off, sothat the touch control module 12 is switched off; the fifth and sixthtransistors T5, T6 amplify the voltage at the gates thereof and outputthe amplified voltage to the data line DATA.

Thus, the data line DATA functions as a line for reading the outputvoltage as the result of the touch at this time, and the fifth and sixthtransistors T5, T6 amplify the voltage at the gates thereof and outputthe amplified voltage to the data line DATA, so that the result of thetouch is output to a touch control signal reading circuit arranged inthe periphery of the display panel.

The above three phases show the operational procedure of the touchcontrol function circuit, wherein the touch control function is realizedby detecting and reading the touch control signal.

During the writing phase (WRITE), the signals S2 _(—) n−1, S1 _(—) n, S2_(—) n and S3 _(—) n are at a high level. At this time, the seventhtransistor T7 is turned off, the second, third and fourth transistorsT2, T3 and T4 are turned on, the data line DATA inputs a grayscalecurrent to charge the gates of the fifth and sixth transistors T5, T6and the storage capacitor C1.

Since the AMOLED is a current-driven element, the data line DATA inputsa grayscale current I_(DATA), the gate and the drain of the fifthtransistor T5 are connected, and the gate and the drain of the sixthtransistor T6 are connected, the fifth and sixth transistors T5, T6 arein a saturation state. I_(DATA)=I_(DS1)+I_(DS2), where I_(DS1)represents the saturation drain current of the fifth transistor T5,I_(DS2) represents the saturation drain current of the sixth transistorT6, I_(DATA) represents the current for charging a pixel and is inputfrom the peripheral driving circuit for charging the storage capacitorC1.

I _(DATA) =I _(DS1)

Since the gate of the fifth transistor T5 is connected to the gate ofthe fifth transistor T6, and the sixth transistor T6 is in thesaturation state, so I_(DS2)=½k₂(V_(GS)−V_(TH))²;

Thus,

${I_{{DS}\; 1} = {{\frac{1}{2}{k_{1}\left( {V_{GS} - V_{TH}} \right)}^{2}} = {{\frac{1}{2}{k_{2}\left( {V_{GS} - V_{TH}} \right)}^{2}\frac{k_{1}}{k_{2}}} = {\frac{k_{1}}{k_{2}}I_{{DS}\; 2}}}}},$

that is,

$I_{DATA} = {\frac{k_{1}}{k_{2}}I_{{DS}\; 2}\bullet}$

During the light-emitting phase (OLED), the signals S1 _(—) n and S3_(—) n are at a low level, and the signals S2 _(—) n−1 and S2 _(—) n areat a high level. At this time, the second, third and seventh transistorsT2, T3 and T7 are turned off, the first transistor T1 is turned on, thesixth transistor T6 operates in a linear region, the second transistorT2 operates in a saturation region, and the light-emitting element D1 isdriven to emit light for display.

In particular, the drain current of the sixth transistor T6 isrepresented by I_(DS2)′=k₂((V_(GS)−V_(TH))·V_(DS2)−½V_(DS2) ²),

and the drain current of the first transistor T1 is represented byI_(DS5)′=½k₅(V_(GS5)−V_(TH))²,

I _(DS5)′=½k ₅(V _(GS5) −V _(TH))²=½k ₅[(V _(GS) −V _(TH))²−2V _(DS2)(V_(GS) −V _(TH))+V _(DS2) ²]

=½k ₅·(V _(GS) −V _(TH))² −k ₅ ·V _(DS2)(V _(GS) −V _(TH))+½k ₅ ·V_(DS2) ²

I _(DS2) ′=k ₂((V _(GS) −V _(TH))·V _(DS2)−−½V _(DS2) ²).

Since

$\begin{matrix}{{I_{{DS}\; 2}^{\prime} = {I_{{DS}\; 5}^{\prime} = I_{OLED}}},} \\{{\frac{1}{2}{k_{5} \cdot \left( {V_{GS} - V_{TH}} \right)^{2}}} - {k_{5} \cdot {V_{{DS}\; 2}\left( {V_{GS} - V_{TH}} \right)}} + {\frac{1}{2}{k_{5} \cdot}}} \\{V_{{DS}\; 2}^{2} = {{k_{2} \cdot \left( {V_{GS} - V_{TH}} \right) \cdot V_{{DS}\; 2}} - {\frac{1}{2}{k_{2} \cdot V_{{DS}\; 2}^{2}}}}} \\{= {{> {{\frac{k_{5}}{k_{2}} \cdot I_{{DS}\; 2}} - {\left( {k_{2} + k_{5}} \right) \cdot {V_{{DS}\; 2}\left( {V_{GS} - V_{TH}} \right)}} + {\frac{1}{2}{\left( {k_{2} + k_{5}} \right) \cdot V_{{DS}\; 2}^{2}}}}} = 0}} \\{= {{> {{\frac{k_{5}}{k_{2}} \cdot I_{{DS}\; 2}} - {\left( {k_{2} + k_{5}} \right) \cdot \left( {{V_{{DS}\; 2} \cdot \left( {V_{GS} - V_{TH}} \right)} - {\frac{1}{2}V_{{DS}\; 2}^{2}}} \right)}}} = 0}} \\{= {{> {{\frac{k_{5}}{k_{2}} \cdot I_{{DS}\; 2}} - {{k_{2}\left( {1 + \frac{k_{5}}{k_{2}}} \right)} \cdot \left( {{V_{{DS}\; 2} \cdot \left( {V_{GS} - V_{TH}} \right)} - {\frac{1}{2}V_{{DS}\; 2}^{2}}} \right)}}} = 0}} \\{= {{> {\frac{k_{5}}{k_{2}} \cdot I_{{DS}\; 2}}} = {{\frac{k_{2} + k_{5}}{k_{2}} \cdot I_{{DS}\; 2}^{\prime}}\mspace{14mu} = {{> I_{{DS}\; 2}} = {\frac{k_{2} + k_{5}}{k_{5}} \cdot I_{{DS}\; 2}^{\prime}}}}}}\end{matrix}$

As I_(OLED)=I_(DS2)′,

${I_{{DS}\; 2} = {\frac{k_{2} + k_{5}}{k_{5}} \cdot I_{{DS}\; 2}^{\prime}}},$

as described above,

${I_{DATA} = {\frac{k_{1}}{k_{2}}I_{{DS}\; 2}}},$

and thus,

$I_{DATA} = {{\frac{k_{2} + k_{5}}{k_{5}} \cdot \frac{k_{1}}{k_{2}}}{I_{OLED}.}}$

I_(OLED) is in a direct proportion to I_(DATA), and the values of k1, k2and k5 can be selected so that there is a relatively large scale betweenI_(DATA) and I_(OLED).

Since there is a relatively large scale

$\frac{k_{1}}{k_{2}} \cdot \frac{k_{2} + k_{5}}{k_{5}}$

between the charging current I_(DATA) and the driving current I_(OLED),it can be achieved that there is a relatively large charging currentI_(DATA) while ensuring that the I_(OLED) is in the range of theoperating current of the OLED, so that the charging for the storagecapacitor C₁ is expedited and the light-emitting element D1 can emitlight until a next frame.

It should be noted that the above descriptions are given to the methodfor driving the AMOLED pixel circuit provided in the embodiments of thepresent disclosure by taking the AMOLED pixel circuit shown in FIG. 2 asan example. The method for driving the AMOLED pixel circuit provided inthe embodiments of the present disclosure can also be applicable to theAMOLED pixel circuit shown in FIG. 3, wherein the specific procedurescan be referred to the above embodiments, and the details are omitted.

In the method for driving the AMOLED pixel circuit with such a structureprovided in the embodiments of the present disclosure, the in-cell touchcontrol circuit and the AMOLED pixel circuit can be driven in a timedivision manner by adjusting the timing sequences of the signals fordriving without increasing the number of the signals, so that theintegration of the in-cell touch control circuit with the AMOLED drivingcircuit is improved greatly, and it can be realized that the in-celltouch screen panel circuit and the AMOLED driving circuit aremanufactured simultaneously in the limited space of the pixel unit, thusenhancing the quality of the display product significantly and reducingthe difficulties in manufacturing the display product.

It is appreciated for those skilled in the art that all or some of thesteps in the method provided in the above embodiments can be implementedby the hardware related to the program instructions, and the program canbe stored in the computer readable storage medium, and the steps of themethod provided in the embodiments can be carried out when the programis executed; the aforementioned storage medium comprises ROM, RAM, themagnetic disk, optical disk, and any medium capable of storing theprogram codes.

It should be appreciated that the above embodiments are only forillustrating the principle of the present disclosure, and in no waylimit the scope of the present disclosure. It will be obvious that thoseskilled in the art may make modifications, variations and equivalencesto the above embodiments without departing from the spirit and scope ofthe present disclosure as defined by the following claims. Suchvariations and modifications are intended to be included within thespirit and scope of the present disclosure.

1. An AMOLED pixel circuit, characterized by comprising a light-emittingmodule, a touch control module, a control module, and a driving andamplifying module; wherein the light-emitting module is connected to thecontrol module and a first voltage terminal, and is used for emittinglight for display under the control of the control module; the touchcontrol module is connected to the control module and a second signalline, and is used for receiving a touch control signal as input; thecontrol module is further connected to a first signal line, the secondsignal line, a third signal line, and a data line, and is used forcontrolling the light-emitting module and the touch control moduleaccording to signals input from the signal lines; and the driving andamplifying module is connected to the light-emitting module, the touchcontrol module, the control module and a second voltage terminal, and isused for driving the light-emitting module or amplifying the touchcontrol signal received by the touch control module.
 2. The AMOLED pixelcircuit of claim 1, characterized in that the light-emitting modulecomprises: a first transistor having a gate connected the control moduleand a second electrode connected to the driving and amplifying module;and a light-emitting element having one terminal connected to a firstelectrode of the first transistor and the other terminal connected tothe first voltage terminal.
 3. The AMOLED pixel circuit of claim 2,characterized in that the control module comprises: a second transistorhaving a gate connected to the first signal line, a first electrodeconnected to the light-emitting element, and a second electrodeconnected to the driving and amplifying module; a third transistorhaving a gate connected to the third signal line, a first electrodeconnected to the gate of the first transistor, and a second electrodeconnected to the data line; and a fourth transistor having a gateconnected to the second signal line, a first electrode connected to thedriving and amplifying module, and a second electrode connected to thedata line.
 4. The AMOLED pixel circuit of claim 3, characterized in thatthe driving and amplifying module comprises: a fifth transistor having agate connected to the first electrode of the third transistor, a firstelectrode connected to the second voltage terminal, and a secondelectrode connected to the first electrode of the fourth transistor; asixth transistor having a gate connected to the first electrode of thethird transistor, a first electrode connected to the second voltageterminal, and a second electrode connected to the second electrode ofthe first transistor and the second electrode of the second transistor;and a storage capacitor having one terminal connected to the firstelectrode of the third transistor, and the other terminal connected tothe second voltage terminal.
 5. The AMOLED pixel circuit of claim 4,characterized in that the touch control module comprises: a seventhtransistor having a gate connected to the second signal line, and afirst electrode connected to the first electrode of the thirdtransistor; and an optoelectronic diode having an anode connected to thesecond voltage terminal, and a cathode connected to a second electrodeof the seventh transistor.
 6. The AMOLED pixel circuit of claim 4,characterized in that the touch control module comprises: a seventhtransistor having a gate connected to the second signal line, and afirst electrode connected to the first electrode of the thirdtransistor; and a sensing electrode connected to a second electrode ofthe seventh transistor.
 7. The AMOLED pixel circuit of claim 5,characterized in that the first, second, third, fourth, fifth and sixthtransistors are N-type transistors, and the seventh transistor is aP-type transistor; or the first, second, third, fourth, fifth and sixthtransistors are P-type transistors, and the seventh transistor is anN-type transistor.
 8. A display device comprising the AMOLED pixelcircuit of claim
 1. 9. A method for driving the AMOLED pixel circuit ofclaim 1, comprising: switching off the light-emitting module, inputtingan initialization signal from the data line, and initializing the touchcontrol module and the driving and amplifying module by the controlmodule according to the initialization signal; receiving the touchcontrol signal by the touch control module; switching off the touchcontrol module, and amplifying the touch control signal by the drivingand amplifying module and outputting the amplified touch control signalto the data line; pre-charging the driving and amplifying module via thecontrol module by the data signal input from the data line; andswitching on the light-emitting module, and driving the light-emittingmodule by the driving and amplifying module to emit light for display.10. A method for driving the AMOLED pixel circuit of claim 5,comprising: switching off the light-emitting module, inputting aninitialization signal from the data line, and initializing the touchcontrol module and the driving and amplifying module by the controlmodule according to the initialization signal; receiving the touchcontrol signal by the touch control module; switching off the touchcontrol module, and amplifying the touch control signal by the drivingand amplifying module and outputting the amplified touch control signalto the data line; pre-charging the driving and amplifying module via thecontrol module by the data signal input from the data line; andswitching on the light-emitting module, and driving the light-emittingmodule by the driving and amplifying module to emit light for display,wherein the method further comprises: an initialization phase, whereinthe first transistor is turned off so that the light-emitting element isswitched off, and the seventh transistor is turned on so that the touchcontrol module is electrically connected to the gate of the fifthtransistor and the gate of the sixth transistor, and the storagecapacitor serves as a storage capacitor of the fifth transistor and thesixth transistor; the third transistor is turned on, the data lineinputs an initialization signal, and the storage capacitor ispre-charged to a level of the initialization signal; a touch controlphase, wherein the third transistor and the fourth transistor are turnedoff, the seventh transistor is turned on, and the touch control modulereceives the touch control signal; a reading phase, wherein the fourthtransistor is turned on, the third and seventh transistors are turnedoff, so that the touch control module is switched off, and the fifthtransistor and the sixth transistor amplify the voltage at the gates ofthe fifth and sixth transistors and output the amplified voltage to thedata line; a writing phase, wherein the seventh transistor is turnedoff, the second, third and fourth transistors are turned on, the dataline inputs a grayscale current to charge the gate of the fifthtransistor, the gate of the sixth transistor and the storage capacitor;and a light-emitting phase, wherein the second, third, and seventhtransistors are turned off, the first transistor is turned on, the sixthtransistor operates in a linear region, and the second transistoroperates in a saturation region, and the light-emitting element isdriven to emit light for display.
 11. The method of claim 9,characterized in that said receiving the touch control signal by thetouch control module comprises: determining to receive the touch controlsignal by the touch control module according to quantity of the lightreceived by the optoelectronic diode when a touch control operation isperformed; or determining to receive the touch control signal by thetouch control module according to a capacitance value of a sensingcapacitor formed between a sensing electrode and a touch terminal of theuser when the touch control operation is performed.
 12. The method ofclaim 10, characterized in that the first, second, third, fourth, fifthand sixth transistors are N-type transistors, and the seventh transistoris a P-type transistor; or the first, second, third, fourth, fifth andsixth transistors are P-type transistors, and the seventh transistor isan N-type transistor.
 13. The AMOLED pixel circuit of claim 6,characterized in that the first, second, third, fourth, fifth and sixthtransistors are N-type transistors, and the seventh transistor is aP-type transistor; or the first, second, third, fourth, fifth and sixthtransistors are P-type transistors, and the seventh transistor is anN-type transistor.
 14. The display device of claim 8, characterized inthat the light-emitting module comprises: a first transistor having agate connected the control module and a second electrode connected tothe driving and amplifying module; and a light-emitting element havingone terminal connected to a first electrode of the first transistor andthe other terminal connected to the first voltage terminal.
 15. Thedisplay device of claim 14, characterized in that the control modulecomprises: a second transistor having a gate connected to the firstsignal line, a first electrode connected to the light-emitting element,and a second electrode connected to the driving and amplifying module; athird transistor having a gate connected to the third signal line, afirst electrode connected to the gate of the first transistor, and asecond electrode connected to the data line; and a fourth transistorhaving a gate connected to the second signal line, a first electrodeconnected to the driving and amplifying module, and a second electrodeconnected to the data line.
 16. The display device of claim 15,characterized in that the driving and amplifying module comprises: afifth transistor having a gate connected to the first electrode of thethird transistor, a first electrode connected to the second voltageterminal, and a second electrode connected to the first electrode of thefourth transistor; a sixth transistor having a gate connected to thefirst electrode of the third transistor, a first electrode connected tothe second voltage terminal, and a second electrode connected to thesecond electrode of the first transistor and the second electrode of thesecond transistor; and a storage capacitor having one terminal connectedto the first electrode of the third transistor, and the other terminalconnected to the second voltage terminal.
 17. The display device ofclaim 16, characterized in that the touch control module comprises aseventh transistor having a gate connected to the second signal line,and a first electrode connected to the first electrode of the thirdtransistor; and an optoelectronic diode having an anode connected to thesecond voltage terminal, and a cathode connected to a second electrodeof the seventh transistor; or the touch control module comprises aseventh transistor having a gate connected to the second signal line,and a first electrode connected to the first electrode of the thirdtransistor; and a sensing electrode connected to a second electrode ofthe seventh transistor.
 18. The display device of claim 17,characterized in that the first, second, third, fourth, fifth and sixthtransistors are N-type transistors, and the seventh transistor is aP-type transistor; or the first, second, third, fourth, fifth and sixthtransistors are P-type transistors, and the seventh transistor is anN-type transistor.
 19. A method for driving the AMOLED pixel circuit ofclaim 6, comprising: switching off the light-emitting module, inputtingan initialization signal from the data line, and initializing the touchcontrol module and the driving and amplifying module by the controlmodule according to the initialization signal; receiving the touchcontrol signal by the touch control module; switching off the touchcontrol module, and amplifying the touch control signal by the drivingand amplifying module and outputting the amplified touch control signalto the data line; pre-charging the driving and amplifying module via thecontrol module by the data signal input from the data line; andswitching on the light-emitting module, and driving the light-emittingmodule by the driving and amplifying module to emit light for display,wherein the method further comprises: an initialization phase, whereinthe first transistor is turned off so that the light-emitting element isswitched off, and the seventh transistor is turned on so that the touchcontrol module is electrically connected to the gate of the fifthtransistor and the gate of the sixth transistor, and the storagecapacitor serves as a storage capacitor of the fifth transistor and thesixth transistor; the third transistor is turned on, the data lineinputs an initialization signal, and the storage capacitor ispre-charged to a level of the initialization signal; a touch controlphase, wherein the third transistor and the fourth transistor are turnedoff, the seventh transistor is turned on, and the touch control modulereceives the touch control signal; a reading phase, wherein the fourthtransistor is turned on, the third and seventh transistors are turnedoff, so that the touch control module is switched off, and the fifthtransistor and the sixth transistor amplify the voltage at the gates ofthe fifth and sixth transistors and output the amplified voltage to thedata line; a writing phase, wherein the seventh transistor is turnedoff, the second, third and fourth transistors are turned on, the dataline inputs a grayscale current to charge the gate of the fifthtransistor, the gate of the sixth transistor and the storage capacitor;and a light-emitting phase, wherein the second, third, and seventhtransistors are turned off, the first transistor is turned on, the sixthtransistor operates in a linear region, and the second transistoroperates in a saturation region, and the light-emitting element isdriven to emit light for display.
 20. The method of claim 19,characterized in that the first, second, third, fourth, fifth and sixthtransistors are N-type transistors, and the seventh transistor is aP-type transistor; or the first, second, third, fourth, fifth and sixthtransistors are P-type transistors, and the seventh transistor is anN-type transistor.